JPH04372719A - Magnetic recording medium and production thereof - Google Patents
Magnetic recording medium and production thereofInfo
- Publication number
- JPH04372719A JPH04372719A JP15000991A JP15000991A JPH04372719A JP H04372719 A JPH04372719 A JP H04372719A JP 15000991 A JP15000991 A JP 15000991A JP 15000991 A JP15000991 A JP 15000991A JP H04372719 A JPH04372719 A JP H04372719A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magnetic recording
- fluororesin
- protective film
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 81
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000000314 lubricant Substances 0.000 claims abstract description 43
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 239000003960 organic solvent Substances 0.000 claims description 11
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009832 plasma treatment Methods 0.000 claims description 2
- 239000010408 film Substances 0.000 abstract description 33
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 11
- 239000000126 substance Substances 0.000 abstract description 10
- 239000010409 thin film Substances 0.000 abstract description 10
- 239000002904 solvent Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- AJDIZQLSFPQPEY-UHFFFAOYSA-N 1,1,2-Trichlorotrifluoroethane Chemical compound FC(F)(Cl)C(F)(Cl)Cl AJDIZQLSFPQPEY-UHFFFAOYSA-N 0.000 description 1
- 229910020630 Co Ni Inorganic materials 0.000 description 1
- 229910002440 Co–Ni Inorganic materials 0.000 description 1
- 229910018104 Ni-P Inorganic materials 0.000 description 1
- 229910018536 Ni—P Inorganic materials 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- 239000010702 perfluoropolyether Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、磁気記録装置、例えば
、磁気ハードディスク装置，磁気テープ装置，フロッピ
ーディスク装置，磁気カード装置などに用いられる磁気
記録媒体およびその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium used in magnetic recording devices such as magnetic hard disk drives, magnetic tape drives, floppy disk drives, magnetic card drives, etc., and a method for manufacturing the same.
【０００２】0002
【従来の技術】磁気記録装置の中で高記録密度に伴い耐
摩耗，耐摩擦が厳しく追求されるものの一つとして磁気
ハードディスク装置がある。その磁気ハードディスク装
置（以下、磁気記録媒体と称す）の代表的な構成図を図
５に示す。同図において、アルミニウム基板上に非磁性
支持体であるＮｉ−Ｐ層１をプレーティングし、その上
に強磁性金属膜（Ｃｏ−Ｎｉなど）２、耐食性保護膜（
Ｃｒなど）３、カーボン保護膜４をスパッタリング法で
作成し、最後に潤滑剤層（パーフルオロアルキルポリエ
ーテルなど）５を塗布していた。2. Description of the Related Art Among magnetic recording devices, a magnetic hard disk device is one of those in which wear resistance and friction resistance are strictly pursued in response to high recording density. A typical configuration diagram of the magnetic hard disk device (hereinafter referred to as a magnetic recording medium) is shown in FIG. In the figure, a Ni-P layer 1, which is a non-magnetic support, is plated on an aluminum substrate, and a ferromagnetic metal film (such as Co-Ni) 2 and a corrosion-resistant protective film (
Cr, etc.) 3, a carbon protective film 4 was created by sputtering, and finally a lubricant layer (perfluoroalkyl polyether, etc.) 5 was applied.
【０００３】現在、磁気記録媒体の記録再生用として通
常浮動型磁気ヘッドを用いており、その起動・停止の方
法としてはコンタクト・スタート・ストップ方式（以下
ＣＳＳと称す）が主流を占めている。このＣＳＳでは、
磁気記録媒体回転の起動・停止時に記録再生磁気ヘッド
（以下ヘッドと称す）が磁気記録媒体面上に摺動する。
これによって、ヘッドや磁気記録媒体表面が摩耗したり
、両者間の摩擦係数が上昇したり、甚だしい場合はヘッ
ドあるいは磁気記録媒体の磁性層の破壊（クラッシュ）
が発生する場合がある。従ってこのような問題点を回避
するため上記構成のものが使用されてきた。しかし、そ
れでも耐久性としてはまだ充分満足できるものではなか
ったため新しい潤滑剤として開発されたのが部分フッ素
化アルキル系潤滑剤であった（特開昭６２−２１９３１
４号公報）。Currently, floating magnetic heads are generally used for recording and reproducing magnetic recording media, and the contact start-stop system (hereinafter referred to as CSS) is the mainstream method for starting and stopping them. In this CSS,
When starting and stopping rotation of the magnetic recording medium, a recording/reproducing magnetic head (hereinafter referred to as head) slides on the surface of the magnetic recording medium. This may cause wear on the head or magnetic recording medium surface, increase the coefficient of friction between the two, or in severe cases, damage the magnetic layer of the head or magnetic recording medium (crash).
may occur. Therefore, in order to avoid such problems, the above configuration has been used. However, the durability was still not fully satisfactory, so a new lubricant was developed, a partially fluorinated alkyl lubricant (Japanese Patent Laid-Open No. 62-21931).
Publication No. 4).
【０００４】しかし、記録密度を高めるため現状よりも
さらにヘッド浮上量を小さくする方向に進んでいる。そ
れに伴って磁気記録媒体の信頼性も従来の技術では充分
満足し切れなくなった。ヘッド浮上特性は磁気記録媒体
が約３６００ｒｐｍ高速回転している際浮上しているヘ
ッドは磁気記録媒体表面の微小突起に衝突することなく
安定に浮上しなければならない。仮に高速回転中、ヘッ
ドが微小突起に衝突した場合、磁気記録媒体の表面の摩
耗が加速され、磁性層の破壊を起こす場合もある。した
がって、このヘッド浮上特性を安定なものにするため磁
気記録媒体の表面粗さをできるだけ小さくするなどの方
法で微小突起を抑えなければならない。However, in order to increase the recording density, progress is being made in the direction of reducing the flying height of the head even more than at present. Along with this, the reliability of magnetic recording media is no longer fully satisfied with conventional techniques. Regarding head flying characteristics, when the magnetic recording medium is rotating at a high speed of about 3600 rpm, the flying head must fly stably without colliding with minute protrusions on the surface of the magnetic recording medium. If the head collides with a minute protrusion during high-speed rotation, the wear on the surface of the magnetic recording medium will be accelerated and the magnetic layer may be destroyed. Therefore, in order to stabilize the head flying characteristics, it is necessary to suppress minute protrusions by reducing the surface roughness of the magnetic recording medium as much as possible.
【０００５】この表面粗さの小さい磁気記録媒体では長
時間にわたりヘッドと磁気記録媒体が接触したままの状
態で放置するとヘッド−磁気記録媒体間に大気中の水蒸
気や潤滑剤が毛細管現象で疑集しスティクション（初期
の摩擦係数μｓが上昇する）を起こしやすくなる。この
現象は、磁気記録装置の保管環境に依存し高温高湿状態
になればなるだけ顕著に起こる。したがって、磁気記録
媒体はできるだけ表面エネルギーを小さくし撥水性に富
んだ表面にしなければならない。さらに、ヘッド浮上量
が少なくなった分ヘッド−磁気記録媒体の摺動時間は長
くなり摩擦摩耗特性も悪くなるが、潤滑剤がそれを補う
だけの特性を示さなければならない。In a magnetic recording medium with a small surface roughness, if the head and the magnetic recording medium are left in contact for a long time, water vapor and lubricant in the atmosphere will collect between the head and the magnetic recording medium due to capillary action. This tends to cause stiction (an increase in the initial friction coefficient μs). This phenomenon depends on the environment in which the magnetic recording device is stored, and occurs more prominently in high temperature and high humidity conditions. Therefore, the magnetic recording medium must have a surface energy as low as possible and a highly water-repellent surface. Furthermore, as the flying height of the head decreases, the sliding time between the head and the magnetic recording medium becomes longer and the friction and wear characteristics deteriorate, but the lubricant must exhibit characteristics that can compensate for this.
【０００６】一般に、カーボン保護膜の代替としてのフ
ッ素樹脂は非常に摩擦特性が優れ、さらに撥水性に富ん
だ材料の一つとして従来から各所の研究機関で検討され
ている。フッ素樹脂は有機溶剤には溶解しないためその
薄膜の形成は専らＣＶＤ，スパッタリング，プラズマ重
合などの乾式コーティング法で行われている。しかし、
このような方法でフッ素樹脂層を形成しても当初期待し
ていた摩擦特性は得られていないのが現実である。[0006] In general, fluororesin as a substitute for a carbon protective film has been studied in various research institutes as a material that has extremely excellent frictional properties and is also highly water repellent. Since fluororesin does not dissolve in organic solvents, its thin film is formed exclusively by dry coating methods such as CVD, sputtering, and plasma polymerization. but,
The reality is that even if a fluororesin layer is formed by such a method, the frictional characteristics initially expected are not obtained.
【０００７】[0007]
【発明が解決しようとする課題】高記録密度を達成する
ため、ヘッド浮上量を少なくしてＣＳＳを行うと摩耗摩
擦特性が悪化する。これは、ヘッド浮上量が少なくなる
とＣＳＳの際に生じるヘッド−磁気記録媒体間の摺動時
間が長くなり磁気記録媒体への損傷を増大することによ
り発生する問題である。Problems to be Solved by the Invention If CSS is performed by reducing the flying height of the head in order to achieve high recording density, the wear and friction characteristics will deteriorate. This is a problem that occurs because when the flying height of the head decreases, the sliding time between the head and the magnetic recording medium that occurs during CSS becomes longer, increasing damage to the magnetic recording medium.
【０００８】さらに、ヘッド浮上量が少なくなると磁気
記録媒体表面の粗さも小さくしなければならない。これ
は、磁気記録媒体の表面粗さが大きいとヘッドが磁気記
録媒体表面の微小突起に衝突し不安定な状態でヘッドが
浮上することになり、それにより最悪の場合磁性層の破
壊が起こる。こうしてヘッド浮上量を少なくするために
は磁気記録媒体表面の粗さを小さくしなければならない
。これにともないヘッドと磁気記録媒体間が静止状態で
長時間放置されるとスティクション（μｓの上昇）が発
生し易くなる。このスティクションは、磁気記録表面粗
さに依存し粗さが小さいほど起こり易くなる。この原因
は潤滑剤や大気中の水蒸気がヘッドと磁気記録媒体間の
微小隙間に入り込んで実質接触面積が大きくなり、ステ
ィクション（μｓの上昇）が発生すると考えられる。
これにより、スピンドルモーターが起動しなくなり不良
の原因となる場合がある。本発明はこのような問題を解
決し、高密度記録用の磁気記録媒体とその製造方法の提
供を目的とする。Furthermore, as the flying height of the head decreases, the roughness of the surface of the magnetic recording medium must also be decreased. This is because if the surface roughness of the magnetic recording medium is large, the head will collide with minute protrusions on the surface of the magnetic recording medium, causing the head to fly in an unstable state, which in the worst case will result in destruction of the magnetic layer. In order to reduce the flying height of the head, the roughness of the surface of the magnetic recording medium must be reduced. Accordingly, if the head and the magnetic recording medium are left stationary for a long time, stiction (increase in μs) is likely to occur. This stiction depends on the roughness of the magnetic recording surface, and the smaller the roughness, the more likely it is to occur. The reason for this is thought to be that lubricant or water vapor in the atmosphere enters the minute gap between the head and the magnetic recording medium, increasing the actual contact area and causing stiction (increase in μs). This may prevent the spindle motor from starting and cause a malfunction. The present invention aims to solve these problems and provide a magnetic recording medium for high-density recording and a method for manufacturing the same.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
本発明の磁気記録媒体は、非磁性支持体上に強磁性金属
膜が形成され、その強磁性金属膜の上に保護膜が形成さ
れ、その保護膜がオキシド構造を有する有機溶剤に可溶
性のフッ素樹脂（以下、単にフッ素樹脂と称する）と有
機潤滑剤の混合物で構成されたものとする。[Means for Solving the Problems] In order to achieve the above object, the magnetic recording medium of the present invention includes a ferromagnetic metal film formed on a non-magnetic support, and a protective film formed on the ferromagnetic metal film. Assume that the protective film is composed of a mixture of an organic solvent-soluble fluororesin (hereinafter simply referred to as fluororesin) having an oxide structure and an organic lubricant.
【００１０】0010
【作用】上記構成によりバルクと同じ化学構造のフッ素
樹脂の薄膜が形成されることとなる。[Operation] With the above structure, a thin film of fluororesin having the same chemical structure as the bulk is formed.
【００１１】[0011]
【実施例】以下、本発明の実施例について図面を参照し
ながら説明する。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
【００１２】図１は本発明の一実施例における磁気記録
媒体の一部断面図である。同図において１は非磁性支持
体、２は強磁性金属膜、６はオキシド構造を有する有機
溶剤に可溶性のフッ素樹脂と有機潤滑剤の混合物からな
る保護膜である。従来のフッ素樹脂は有機溶剤には溶解
しなかったため乾式コーティング（ＣＶＤやスパッタリ
ングなど）の方法でしか薄膜を形成できなかった。その
ため乾式コーティングで膜を作成しても得られたフッ素
樹脂の薄膜はバルクに比べて平均分子量が小さくなるた
め、バルク並の摩擦特性が得られなかった。しかし、今
回実験を行ったオキシド構造を有する有機溶剤に可溶性
のフッ素樹脂の場合、湿式コーティングが可能なためバ
ルクの化学構造をそのまま薄膜にすることが可能となる
。そのフッ素樹脂の化学構造として（化１）に示すもの
を用いた。FIG. 1 is a partial cross-sectional view of a magnetic recording medium according to an embodiment of the present invention. In the figure, 1 is a nonmagnetic support, 2 is a ferromagnetic metal film, and 6 is a protective film made of a mixture of an organic lubricant and a fluororesin having an oxide structure and soluble in an organic solvent. Conventional fluororesins did not dissolve in organic solvents, so thin films could only be formed by dry coating methods (CVD, sputtering, etc.). For this reason, even if a film was created by dry coating, the resulting thin film of fluororesin had a lower average molecular weight than the bulk material, so it was not possible to obtain the same frictional properties as the bulk material. However, in the case of the fluororesin that is soluble in organic solvents and has an oxide structure, which was used in this experiment, wet coating is possible, making it possible to create a thin film with the same bulk chemical structure. The chemical structure of the fluororesin shown in (Chemical formula 1) was used.
【００１３】[0013]
【化１】[Chemical formula 1]
【００１４】このフッ素樹脂は（化２）に示すオキシド
構造の存在によって有機溶剤に溶解するので容易にディ
ッピング法，スピンコート法，スプレー法などの湿式コ
ーティングが可能となった。さらにフッ素樹脂が有機溶
剤に溶解するため有機潤滑剤と混合もできるようになっ
た。[0014] This fluororesin dissolves in organic solvents due to the presence of the oxide structure shown in (Chemical formula 2), so wet coating such as dipping, spin coating, and spraying methods can be easily applied. Furthermore, since fluororesin dissolves in organic solvents, it has become possible to mix it with organic lubricants.
【００１５】[0015]
【化２】[Case 2]
【００１６】また、このフッ素樹脂は−（ＣＦ２ＣＦ２
）ｍ−というパーフルオロポリエタン（ＰＦＰＥ）が主
鎖になっているため表面エネルギーが非常に小さい。し
たがって、ヘッドに対する凝着も小さく摩耗が低減され
る。さらに、撥水性，撥油性に富んでおり、ヘッド−磁
気記録媒体間に水蒸気の凝集で起こるスティクションや
腐食、さらには大気中の有機物による汚染も抑えられる
。ただし、このフッ素樹脂のみでは潤滑効果は余りない
。したがって、フッ素樹脂と有機潤滑剤とを混合するか
、あるいはフッ素樹脂層の上に有機潤滑層を形成させる
。フッ素樹脂と有機潤滑剤とを混合させた場合、図２の
ようにフッ素樹脂の含有率は２０〜８０重量％が適当で
ある。フッ素樹脂の含有率が少なすぎるとヘッド−磁気
記録媒体間にスティクションが起って摩擦係数が大きく
なり、逆に含有率が多すぎると充分な潤滑特性が得られ
ず摩擦摩耗特性が劣化してしまう。また、この時の保護
膜の厚さは図３のように摩擦摩耗特性を考慮に入れると
２００〜５００Åが適当である。保護膜が余り厚くなる
とスペーシングにより磁気記録再生特性が悪くなるため
、好ましくは２００〜３００Åが良い。フッ素樹脂層の
上に有機潤滑剤層を被覆させる場合は、フッ素樹脂の膜
厚は１００〜５００Å、有機潤滑剤層の厚さは５〜１０
０Åが適当である。有機潤滑剤層の厚さが厚すぎるとヘ
ッド−磁気記録媒体間にスティクションを起こし、逆に
薄すぎると摩擦摩耗特性が劣化してしまう。[0016] Moreover, this fluororesin is -(CF2CF2
) m- as the main chain of perfluoropolyethane (PFPE), so the surface energy is very small. Therefore, adhesion to the head is also small and wear is reduced. Furthermore, it is highly water- and oil-repellent, and can suppress stiction and corrosion caused by water vapor condensation between the head and the magnetic recording medium, as well as contamination by organic matter in the atmosphere. However, this fluororesin alone does not have much of a lubricating effect. Therefore, a fluororesin and an organic lubricant are mixed, or an organic lubricant layer is formed on the fluororesin layer. When a fluororesin and an organic lubricant are mixed, the appropriate content of the fluororesin is 20 to 80% by weight, as shown in FIG. If the content of fluororesin is too low, stiction will occur between the head and the magnetic recording medium, increasing the coefficient of friction; on the other hand, if the content is too high, sufficient lubricating properties will not be obtained and the friction and wear characteristics will deteriorate. It ends up. Further, as shown in FIG. 3, the thickness of the protective film at this time is suitably 200 to 500 Å, taking into account the friction and wear characteristics. If the protective film is too thick, the magnetic recording and reproducing characteristics will deteriorate due to spacing, so the thickness is preferably 200 to 300 Å. When coating an organic lubricant layer on a fluororesin layer, the thickness of the fluororesin is 100 to 500 Å, and the thickness of the organic lubricant layer is 5 to 10 Å.
0 Å is appropriate. If the organic lubricant layer is too thick, stiction will occur between the head and the magnetic recording medium, and if it is too thin, the friction and wear characteristics will deteriorate.
【００１７】また、フッ素樹脂層と基板表面（磁性層）
の付着力を向上させる目的のためにフッ素樹脂（あるい
は有機潤滑剤との混合層）をコーティングする際に強磁
性金属膜をプラズマ処理やオゾン処理して表面を活性に
したのちフッ素樹脂層（あるいはフッ素樹脂と潤滑剤と
の混合層）を設けるとさらに良好な摩擦摩耗特性を示す
。[0017] Furthermore, the fluororesin layer and the substrate surface (magnetic layer)
When coating a fluororesin (or a mixed layer with an organic lubricant) to improve the adhesion of the ferromagnetic metal film, the surface is activated by plasma treatment or ozone treatment, and then the fluororesin layer (or When a mixed layer of fluororesin and lubricant is provided, even better friction and wear characteristics are exhibited.
【００１８】さらに、保護膜をコーティングした後膜中
の不純ガス（たとえば、フッ素樹脂を溶解させていた有
機溶媒）を排出させるために５０〜２００℃の温度で熱
処理してもより安定した摩擦摩耗特性が得れる。Furthermore, even after coating with a protective film, heat treatment at a temperature of 50 to 200°C to discharge impurity gas (for example, the organic solvent in which the fluororesin was dissolved) in the film results in more stable frictional wear. characteristics can be obtained.
【００１９】保護膜の塗布方法としては、フッ素樹脂と
有機潤滑剤を一定の混合比でイソプロピルアルコール、
またはフロン１１３等の有機溶剤に溶かした後磁気記録
媒体に噴霧法，浸漬法，スピンコート法などの方法で塗
布する。その塗布量は、０．５〜５００ｍｇ／ｍ２であ
るのが望ましいが、磁気記録媒体の表面粗さによって適
正膜厚は決まるため一概にはいえない。この塗布量が少
なすぎると摩擦力の上昇、摩耗の増大が起こり安定した
耐久性は得られない。逆に塗布量が多すぎると記録再生
用ヘッドと磁気記録媒体とでスティクションが起こり耐
久性が劣化する場合がある。The method for applying the protective film is to mix the fluororesin and organic lubricant at a certain mixing ratio with isopropyl alcohol,
Alternatively, it is dissolved in an organic solvent such as Freon 113 and then applied to a magnetic recording medium by a spraying method, dipping method, spin coating method, or the like. The coating amount is preferably 0.5 to 500 mg/m2, but this cannot be said unconditionally because the appropriate film thickness is determined by the surface roughness of the magnetic recording medium. If the coating amount is too small, frictional force and wear will increase, making it impossible to obtain stable durability. On the other hand, if the coating amount is too large, stiction may occur between the recording/reproducing head and the magnetic recording medium, resulting in deterioration of durability.
【００２０】このように作成した試料を０．１μｍ浮上
のＭｎ−ＺｎフェライトヘッドでＣＳＳ試験を行いＣＳ
Ｓ２００００回後の動摩擦係数の最大値を調べた。The sample thus prepared was subjected to a CSS test using a Mn-Zn ferrite head with a floating height of 0.1 μm.
The maximum value of the dynamic friction coefficient after 20,000 S cycles was investigated.
【００２１】上記の各試料のＣＳＳ試験結果を試料の内
容と対比させて（表１）および（表２）に記した。[0021] The CSS test results of each of the above samples are shown in Table 1 and Table 2 in comparison with the contents of the samples.
【００２２】[0022]
【表１】[Table 1]
【００２３】[0023]
【表２】[Table 2]
【００２４】（表１）にはフッ素樹脂と有機潤滑剤との
混合層によるＣＳＳの結果を、（表２）にはフッ素樹脂
上に有機潤滑剤をコーティングした時の結果を示す。Table 1 shows the results of CSS using a mixed layer of fluororesin and organic lubricant, and Table 2 shows the results when organic lubricant was coated on fluororesin.
【００２５】（表１），（表２）の結果から明らかなよ
うに、本発明の各実施例は、動摩擦係数がＣＳＳ２００
００回で０．３以下と小さく極めて安定な耐久性を示し
ている。さらに、この混合潤滑剤を塗布した後熱処理し
たり（実施例５，１０）、混合潤滑剤を塗布する前にカ
ーボン表面をオゾン処理しても（実施例６）特性は向上
している。また比較例の結果より、従来のカーボンに潤
滑剤をコーティングした磁気記録媒体のＣＳＳの結果（
比較例１，２）、あるいはフッ素樹脂単体でのＣＳＳの
結果（比較例３）で低い摩擦係数が得られなかった。As is clear from the results in Tables 1 and 2, each of the examples of the present invention has a dynamic friction coefficient of CSS200.
It shows extremely stable durability with a value of 0.3 or less after 00 cycles. Further, the characteristics were improved even if heat treatment was performed after applying this mixed lubricant (Examples 5 and 10), or ozone treatment of the carbon surface before applying the mixed lubricant (Example 6). Also, from the results of the comparative example, the CSS results of a magnetic recording medium in which conventional carbon was coated with a lubricant (
A low coefficient of friction was not obtained in Comparative Examples 1 and 2) or CSS using only the fluororesin (Comparative Example 3).
【００２６】また、ヘッド−磁気記録媒体間に起こるス
ティクションの結果を図４に示す。縦軸にμｓ、横軸に
有機潤滑剤層の膜厚を示す。従来のカーボン保護膜に潤
滑剤（パーフルオロポリエーテル）をコーティングした
磁気記録媒体の結果をａ、フッ素樹脂層上に同じ潤滑剤
をコーティングした磁気記録媒体の結果をｂで表した。
ａの場合潤滑剤層が薄くなるとカーボン表面が水蒸気を
吸着しそのためスティクション（μｓの上昇）が大きく
なり、また、潤滑剤層の膜厚が厚くなると潤滑剤に水蒸
気が吸着しスティクションが大きくなる。ところが、フ
ッ素樹脂層上に潤滑剤層をコーティングした場合のステ
ィクションの結果ｂは、潤滑剤層が薄くても表面エネル
ギーの小さいフッ素樹脂層の影響で水蒸気の影響は受け
ずスティクションは起こらない。さらに、潤滑剤層の膜
厚が厚くなってもフッ素樹脂層の影響でカーボン保護膜
の場合よりもスティクションは起こりにくくなっている
。このようにフッ素樹脂層を磁気記録媒体に用いること
によりスティクションも低減させることが可能となった
。FIG. 4 shows the results of stiction occurring between the head and the magnetic recording medium. The vertical axis shows μs, and the horizontal axis shows the film thickness of the organic lubricant layer. The results for a magnetic recording medium in which a conventional carbon protective film is coated with a lubricant (perfluoropolyether) are shown in a, and the results in a magnetic recording medium in which a fluororesin layer is coated with the same lubricant are shown in b. In the case of a, when the lubricant layer becomes thinner, the carbon surface adsorbs water vapor, which increases stiction (increase in μs), and when the lubricant layer becomes thicker, water vapor adsorbs to the lubricant, increasing stiction. Become. However, stiction result b when a lubricant layer is coated on a fluororesin layer is that even if the lubricant layer is thin, it is not affected by water vapor and stiction does not occur due to the influence of the fluororesin layer, which has a small surface energy. . Furthermore, even if the lubricant layer becomes thicker, stiction is less likely to occur than in the case of a carbon protective film due to the influence of the fluororesin layer. By using a fluororesin layer in a magnetic recording medium in this way, it has become possible to reduce stiction.
【００２７】さらに、金属薄膜を有する磁気記録媒体で
よく問題になる腐食もこのフッ素樹脂層を設けることに
より効果がある。腐食は大気中の水蒸気が原因となり、
磁気記録媒体表面で電極反応を起こして磁性層を侵しビ
ットエラーとなる。フッ素樹脂はカーボンと比較して充
分な撥水性をもっているため大気中の水蒸気を磁気記録
媒体表面に寄せ付けない働きをすめため腐食に対しても
効果がある。その効果を（表３）に示す。Furthermore, the provision of this fluororesin layer is effective against corrosion, which is often a problem in magnetic recording media having metal thin films. Corrosion is caused by water vapor in the atmosphere,
An electrode reaction occurs on the surface of the magnetic recording medium, corroding the magnetic layer and causing bit errors. Fluororesin has sufficient water repellency compared to carbon, so it works to keep atmospheric water vapor away from the surface of the magnetic recording medium, and is also effective against corrosion. The effects are shown in (Table 3).
【００２８】[0028]
【表３】[Table 3]
【００２９】これにより従来耐食性保護膜として強磁性
金属薄膜上にクロムをコーティングしていたが、このク
ロムがなくてもフッ素樹脂をコーティングすることによ
り充分耐食効果が得られた。[0029] Conventionally, a ferromagnetic metal thin film was coated with chromium as a corrosion-resistant protective film, but even without chromium, a sufficient corrosion-resistant effect could be obtained by coating with a fluororesin.
【００３０】なお、フッ素樹脂と有機潤滑剤を混合した
保護膜を金属薄膜を有する磁気記録媒体に塗布して作っ
たものも同様にスティクションの低減あるいは腐食に対
する効果を示すことを確認している。[0030] Furthermore, it has been confirmed that a protective film made by applying a mixture of fluororesin and organic lubricant to a magnetic recording medium having a thin metal film similarly exhibits the effect of reducing stiction or preventing corrosion. .
【００３１】[0031]
【発明の効果】以上の説明から明らかなように本発明に
よれば次の効果が得られる。Effects of the Invention As is clear from the above description, the following effects can be obtained according to the present invention.
【００３２】（１） 保護膜をオキシド構造を有する
有機溶剤に可溶性のフッ素樹脂と有機潤滑剤の混合物で
構成することにより、バルクと同じ化学構造のフッ素樹
脂の薄膜が形成されるので耐摩耗性，耐食性の優れた磁
気記録媒体が得られる。(1) By forming the protective film from a mixture of a fluororesin having an oxide structure and soluble in an organic solvent and an organic lubricant, a thin film of fluororesin having the same chemical structure as the bulk is formed, which improves wear resistance. , a magnetic recording medium with excellent corrosion resistance can be obtained.
【００３３】（２） オキシド構造を有する有機溶剤
に可溶性のフッ素樹脂と有機潤滑剤の混合物を用いるこ
とにより湿式塗布法で保護膜を形成できるのでバルクと
同じ化学構造のフッ素樹脂の薄膜が形成され、耐摩耗性
，耐食性の優れた磁気記録媒体が製造できる。(2) By using a mixture of a fluororesin soluble in an organic solvent having an oxide structure and an organic lubricant, a protective film can be formed by a wet coating method, so a thin film of fluororesin having the same chemical structure as the bulk is formed. , magnetic recording media with excellent wear resistance and corrosion resistance can be manufactured.
【図１】本発明の磁気記録媒体の一実施例の断面図FIG. 1 is a cross-sectional view of one embodiment of the magnetic recording medium of the present invention.
【図
２】保護膜におけるフッ素樹脂含有率と摩擦係数の関係
図[Figure 2] Relationship diagram between fluororesin content and friction coefficient in the protective film
【図３】保護膜の厚さと摩擦係数の関係図[Figure 3] Relationship diagram between protective film thickness and friction coefficient
【図４】有機
潤滑剤層の厚さと摩擦係数の関係図[Figure 4] Relationship diagram between organic lubricant layer thickness and friction coefficient
【図５】従来の磁気
記録媒体の断面図[Figure 5] Cross-sectional view of a conventional magnetic recording medium
１ 非磁性支持体 ２ 強磁性金属膜 ６ 保護膜 1 Non-magnetic support 2 Ferromagnetic metal film 6 Protective film
Claims (9)
され、その強磁性金属膜の上に保護膜が形成された磁気
記録媒体において、前記保護膜がオキシド構造を有する
有機溶剤に可溶性のフッ素樹脂と有機潤滑剤の混合物で
構成されたことを特徴とする磁気記録媒体。1. A magnetic recording medium in which a ferromagnetic metal film is formed on a nonmagnetic support and a protective film is formed on the ferromagnetic metal film, wherein the protective film is soluble in an organic solvent having an oxide structure. A magnetic recording medium comprising a mixture of a fluororesin and an organic lubricant.
％、有機潤滑剤を８０〜２０重量％を含有する混合物で
あることを特徴とする請求項１記載の磁気記録媒体。2. The magnetic recording medium according to claim 1, wherein the protective film is a mixture containing 20 to 80% by weight of a fluororesin and 80 to 20% by weight of an organic lubricant.
たことを特徴とする請求項１記載の磁気記録媒体。3. The magnetic recording medium according to claim 1, wherein the protective film has a thickness of 200 to 500 Å.
式塗布法で形成することを特徴とする請求項１記載の磁
気記録媒体の製造方法。4. The method for manufacturing a magnetic recording medium according to claim 1, wherein the mixture of the fluororesin and the organic lubricant is formed by a wet coating method.
され、その強磁性金属膜の上に保護膜が形成された磁気
記録媒体において、前記保護膜が強磁性金属膜の側から
順にフッ素樹脂層と有機潤滑剤層で構成された二層構造
であることを特徴とする磁気記録媒体。5. In a magnetic recording medium in which a ferromagnetic metal film is formed on a non-magnetic support and a protective film is formed on the ferromagnetic metal film, the protective film is arranged in order from the side of the ferromagnetic metal film. A magnetic recording medium characterized by having a two-layer structure composed of a fluororesin layer and an organic lubricant layer.
Å、有機潤滑剤層の厚さを５〜１００Åとしたことを特
徴とする請求項５記載の磁気記録媒体。[Claim 6] The thickness of the fluororesin layer is 100 to 500.
6. The magnetic recording medium according to claim 5, wherein the organic lubricant layer has a thickness of 5 to 100 Å.
布法で形成することを特徴とする請求項５記載の磁気記
録媒体の製造方法。7. The method of manufacturing a magnetic recording medium according to claim 5, wherein the fluororesin layer and the organic lubricant layer are formed by a wet coating method.
たはオゾン処理されたことを特徴とする請求項１または
５記載の磁気記録媒体。8. The magnetic recording medium according to claim 1, wherein the surface of the ferromagnetic metal film is subjected to plasma treatment or ozone treatment.
０〜２００℃で熱処理することを特徴とする請求項４ま
たは７記載の磁気記録媒体の製造方法。[Claim 9] After forming the protective film by a wet coating method, 5
The method for manufacturing a magnetic recording medium according to claim 4 or 7, characterized in that the heat treatment is performed at 0 to 200°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15000991A JPH04372719A (en) | 1991-06-21 | 1991-06-21 | Magnetic recording medium and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15000991A JPH04372719A (en) | 1991-06-21 | 1991-06-21 | Magnetic recording medium and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04372719A true JPH04372719A (en) | 1992-12-25 |
Family
ID=15487484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15000991A Pending JPH04372719A (en) | 1991-06-21 | 1991-06-21 | Magnetic recording medium and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04372719A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007018679A (en) * | 2005-07-07 | 2007-01-25 | Dotetsu Gokin Kk | Magnetic storage medium |
-
1991
- 1991-06-21 JP JP15000991A patent/JPH04372719A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007018679A (en) * | 2005-07-07 | 2007-01-25 | Dotetsu Gokin Kk | Magnetic storage medium |
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